Intelligent design of energy-efficient lighting systems

• Main Authors: Yu-Hsuan Lai, 賴昱軒
• Other Authors: Hung-Yu Wang
• Format: Others
• Language: zh-TW
• Published: 2010
• Online Access: http://ndltd.ncl.edu.tw/handle/76245603977508465968

碩士 === 國立高雄應用科技大學 === 電子工程系 === 98 === Solar energy and green energy have received much attention. Since the conversion efficiency of solar cell can not be increased at present, it is important to make good use of the derived electric power from solar cell. The aim of this thesis is to realize an intelligent design of energy-efficient lighting systems. It has the functions of energy production from solar cell, energy storage and lighting system. The pulse width modulation (PWM) signal controlled by micro programmed control unit (MCU) is used to charge the battery (or power storage unit). To achieve the balance of chemical reaction for efficient charging, we apply PWM signal with charging rest time to the battery. The charging process is detected by the voltage between the terminals of battery for lengthening the battery’s life. The light emitting diodes (LEDs) are used as lighting source of the design. By using an ambient light sensor, the micro programmed control unit (MCU) adjusts the currents in LEDs to achieve constant brightness. The LEDs are controlled by PWM signal of MCU to reduce the power consumption. The lighting system prior uses the energy from power storage unit then MCU will output the power switch signal to control the relay for changing the power supply path when the power storage unit can not supply enough voltage level. To verify the feasibility of our design, a energy-efficient lighting systems is realized. The experiment result shows the power-saving function. The designed system has the advantage of easy extensibility of solar cell, energy storage capability and lighting capability.